Pair of escalator control boxes



FIG. 1 is a right perspective view of a pair of escalator control boxes showing our new design;

FIG. 2 is a left perspective view thereof.

The broken lines show the environment, an escalator terminal, in which the pair of escalator control boxes are placed and form no part of the claimed design. 

The ornamental design for a pair of escalator control boxes, as shown and described. 